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s A Historical Groundwater Monitoring and Analytical Data 7-Eleven Store#19976 1399 North Main Street Manteca CA Well ID! Ethyl- MtBE 1,2- Eth- Meth- Dissolved Elevation Date Benzene Toluene Benzene Xylene TPH-G 8020 MtBE TBA DIPE EtBE TAME DCA EDB anol anol Notes Oxygen DTW SPT WTE TOC (pgn-) Ip !LI ►L {u 1L) { ) t I ip IL pts 'L { IL) (pgfL) p 1L fL {m rLi i t f fee Explanation TPHg=Total petroleum hydrocarbons-as-gasoline 1 2-DCA=1 2 Dichloroethane pg/L=micrograms per Iger M1BE=Methyl-tert-butyl ether EDB=1 2-Dibromoethane mg/L.=milligrams per Mer TBA=Test-butanol DTI=Depth to water —=Not sampled/not measured DIPE=Diisopropyl ether SPT=Separate-phase hydrocarbon thickness ELBE=EthyMert butyl ether WTE=Water table elevation TAME=Tert-amyl-methyl ether TOC=Top of casing elevation in feet above mean sea level Notes Historical data prior to 03/07/03 sample date provided by Shaw E&I BTEX TPHg and MtSE analyzed using EPA Method 802018015 Modified Samples analyzed using EPA Method 82606 starting with 03//1103 sample date a=Deep zone well b=Laboratory results for the 11104199 samples collected from the nested wells MW-1 and MW 1A were switched The table shows corrected data c=Method Blank Contamination The method blank contains the targeted analyte at a reportable level d=Data Missing from Shaw's Historical Table e=Matrix Spike/Matnx Spike Duplicate Results for Benzene Toluene and MtBE were affected by the analyte concentration already present in the un-spiked sample f=Samples from MW-5 and MW 5A inadvertently sampled from the wrong well casing on 3111103 and 6127!03 The sample reported as'MW-5"was collected from MW-5A and the sample reported as"MW-5A"was collected from MW 5 Ig=Hydrocarbons from TPHg do not exhibit Gasoline chromatographic pattern for sample MW-5A 117 Elevenl7-11 Storest199761Tables119976 Current Groundwater xlsHistorical Water Page 11 of 11